Magnetic of transition metals

Obviously, in a presentation such as this, there is not room to develop the basics of the various forms of ligand field theory in detail nor to describe applications to all the relevant physical properties. This chapter will set out to compare the major aspects of the different forms, will give an account of their use in the interpretation of spectra and magnetism of transition metal complexes, and will make some mention of other areas. 

Chromium Organometallic Chemistry Coordination Organometallic Chemistry Principles Magnetism of Transition Metal Ions Metal Ion Toxicity Nutritional Aspects of Metals Trace Elements Oxidation Catalysis by Transition Metal Complexes. 

Theory Spectra Magnetism of Transition Metal Ions P-donor Ligands Water O-donor Ligands. 

Quantitative measurements of the paramagnetism of compounds of the d elements see Magnetism of Transition Metal Ions) also imply delocalization of the unpaired electrons in d orbitals . 

Ammonia N-donor Ligands Chromium Inorganic Coordination Chemistry Coordination Numbers Geometries Copper Inorganic Coordination Chemistry Magnetism of Transition Metal Ions Molecular Orbital Theory Nickel Inorganic Coordination Chemistry Zinc Enzymes Zinc Inorganic Coordination Chemistry. 

The magnetic properties of individual transition metal ions in compounds and complexes are considered in see Magnetism of Transition Metal Ions). There, the properties of a given ion are assumed to be independent of the presence of any other ions. However, the possibility of minor interactions between ions is taken into account in those cases in which the temperature dependence of the inverse magnetic susceptibihty deviates from the Curie law. This was accomphshed by inclusion of the Weiss constant and the generation of the Curie-Weiss law. The properties of extended arrays of this type may be primarily understood in terms of single ions, and they will not be discussed here. 

Electronic Structure of Solids Magnetism of Transition Metal Ions Paramagnetic Organometallic Complexes. 

The synthesis of paramagnetic materials that have specifically tailored magnetic properties is gaining considerable interest (see Magnetism of Extended Arrays in Inorganic Solids and Magnetism of Transition Metal Ions). For example, metallocenes and their derivatives are known to... 

The magnetic and electronic properties of Ti complexes have been well studied. Nearly all Ti complexes exhibit room temperatme-magnetic moments close to the spin-only value of 1.73 BM. " However, rather than showing a great deal of temperatme dependence, as would be expected for a d ion in an electrostatic field of perfect Oh symmetry, the magnetic moments level off and in general vary from 1.5 BM at 80 K to 1.8BM at about 300 K. These effects arise because of distortion and covalence, which cause a delocalization of the electron " (see Magnetism of Transition Metal Ions). 

Triketones and similar polyketones exhibit keto-enol tautomerism and have been found to coordinate to one or more metal atoms (24). Such complexes can bring metal atoms in close proximity, resulting in interesting magnetic properties (see Magnetism of Transition Metal Ions). 

---